<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>流程控制</title>
    <script>
       /*  if (3>5) {
            alert('沙漠骆驼');
        }
        alert('将夜'); */

   /*      var year=prompt('请输入年份');

        if (year%4==0&&year%100!=0||year%400==0) {
            alert('闰年');
        } else {
            alert('平年');
            
        } */

/*         var score=prompt('请输入你的成绩：');
        if (score>=90) {
            alert('A');
        }else if (90>score>80) {
            alert('B');
        } else if(80>score>=70) {
            alert('C');
        } else if (70>score>=60) {
            alert('D');
        } else if (60>score) {
            alert('E');
        } */
        
        var num =prompt('请输入数字：');
        alert(num>10? num:0+num.toString())


    </script>
</head>
<body>
    
</body>
</html>